# Beaches in the town of Guardamar del Segura, in southeastern Spain, were closed for two days after the discovery of two venomous sea slugs in the water. Local police said for safety reasons, all swimming on municipal beaches was banned. The blue dragon, colloquially named for its resemblance to the mythical creature, is only about three centimetres long, but it feeds on other venomous animals before recycling and concentrating that venom, allowing it to paralyse prey 300 times its size. Contact with a blue dragon can be dangerous and cause painful burns on the skin.
Beaches in Spanish tourist hotspot shut after rare, venomous sea slugs found